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fs: rcu-walk aware d_revalidate method

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Require filesystems be aware of .d_revalidate being called in rcu-walk
mode (nd->flags & LOOKUP_RCU). For now do a simple push down, returning
-ECHILD from all implementations.

Signed-off-by: Nick Piggin <npiggin@kernel.dk>
This commit is contained in:
Nick Piggin
2011-01-07 17:49:57 +11:00
parent 44a7d7a878
commit 34286d6662
27 changed files with 215 additions and 61 deletions
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13
fs/autofs4/root.c
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@@ -315,12 +315,19 @@ out_error:
*/
static int autofs4_revalidate(struct dentry *dentry, struct nameidata *nd)
{
struct inode *dir = dentry->d_parent->d_inode;
struct autofs_sb_info *sbi = autofs4_sbi(dir->i_sb);
int oz_mode = autofs4_oz_mode(sbi);
struct inode *dir;
struct autofs_sb_info *sbi;
int oz_mode;
int flags = nd ? nd->flags : 0;
int status = 1;
if (flags & LOOKUP_RCU)
return -ECHILD;
dir = dentry->d_parent->d_inode;
sbi = autofs4_sbi(dir->i_sb);
oz_mode = autofs4_oz_mode(sbi);
/* Pending dentry */
spin_lock(&sbi->fs_lock);
if (autofs4_ispending(dentry)) {